Passive mechanism of pitch recoil in flapping insect wings
Passive mechanism of pitch recoil in flapping insect wings
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DOI：
10.1088/1748-3190/12/1/016008
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发表时间：
2017-02-01
影响因子：
3.4
通讯作者：
Horie, T.
中科院分区：
文献类型：
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作者：
Ishihara, D.;Horie, T.
昆虫翅膀的高扭转灵活性允许在行程反转期间翅膀旋转后产生弹性反冲。然而，这种后坐力的根本机制仍不清楚，因为从冲程反向期间机翼旋转过渡到每个半冲程中间保持高迎角的动态过程，其中惯性、弹性和空气动力效应都产生显着影响。因此，利用三维有限元方法同时求解不可压缩纳维-斯托克斯方程、弹性体运动方程和流固界面条件，直接模拟扑翼与周围空气的相互作用。这种控制空气动力学效应的直接数值模拟表明，后坐力是由于周围空气的动压阻力而在非常接近临界阻尼的瞬态响应中由冲程反向期间扑动加速度引起的自由俯仰振动的残余。这种理解将能够控制前缘涡流和升力的产生，减少扑动机翼所做的功，并解释扑动运动的运动学特性的潜在必要性。
The high torsional flexibility of insect wings allows for elastic recoil after the rotation of the wing during stroke reversal. However, the underlying mechanism of this recoil remains unclear because of the dynamic process of transitioning from the wing rotation during stroke reversal to the maintenance of a high angle of attack during the middle of each half-stroke, when the inertial, elastic, and aerodynamic effects all have a significant impact. Therefore, the interaction between the flapping wing and the surrounding air was directly simulated by simultaneously solving the incompressible Navier-Stokes equations, the equation of motion for an elastic body, and the fluid-structure interface conditions using the three-dimensional finite element method. This direct numerical simulation controlling the aerodynamic effect revealed that the recoil is the residual of the free pitch vibration induced by the flapping acceleration during stroke reversal in the transient response very close to critical damping due to the dynamic pressure resistance of the surrounding air. This understanding will enable the control of the leading-edge vortex and lift generation, the reduction of the work performed by flapping wings, and the interpretation of the underlying necessity for the kinematic characteristics of the flapping motion.